fix: open-issue sweep — drawing, plot, snap, layout and UI fixes

Fixes:
- Font prompt no longer lists bundled ltypeshp/qcadshp shape files (#1626)
- Wide polylines step at a discontinuous segment width; PEDIT marks the
  current vertex; keyword steps refresh the command preview (#1628)
- Radius-0 fillet drops the zero-length segment it left, so the corner
  fillets again (#1422)
- FILLET Trim / No trim option (#1558)
- True-colour wires plot in their own colour; colour picker stores the
  value it shows (#1621)
- Model tab keeps its page setup; "Save changes to layout" in Model (#1620)
- QNEW default template in Options > Files; .dwt in the open dialog
  (#1134, #1113)
- GRIDUNIT / GRIDMODE / PERSPECTIVE variables (#1618, #1524)
- PTYPE (#1433)
- ZOOM nX / nXP (#1465)
- CHSPACE between model and paper space through a viewport (#1428)
- Moving a dimension keeps its automatic text placement
- Shell icon; "&&" button labels (#1554)
- LINETYPE Load from a .lin file (#1588)
- XLINE / RAY hide the crosshair arms (#1437)
- Dynamic-input boxes keep clear of the crosshair and each other (#1546)
- Snap marker colour setting, dark default on light canvases
  (#1497, #1229, #1128)
- Dimension style precision as a 0.00 pattern dropdown (#1426)
- Node graph nodes left of the origin no longer clip away (#1592)
- Collapse button in the command history header (#1094)
- Freeze-in-current-viewport toggle in the ribbon layer list (#1466)
- Geometric Center object snap for closed polylines (#1369)

New strings translated in all 21 locales.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/app/view/mod.rs

@@ -925,6 +925,13 @@ bg={bg_ms:.1}ms n={view_count}"
                     iso_plane: self.iso_plane,
                     snap_angle_deg: self.snap_angle_deg,
                     pick_pending: self.pending_pick_label().is_some(),
+                    // An infinite-line preview runs along the arms; drop them
+                    // so the preview stays visible (#1437).
+                    hide_arms: tab
+                        .active_cmd
+                        .as_ref()
+                        .is_some_and(|c| matches!(c.name(), "XLINE" | "RAY")),
+                    snap_color: self.snap_marker_color,
                 },
                 crate::ui::overlay::SelectionVisualOptions {
                     area: self.model_space.selection_area,

src/app/view/modal.rs

@@ -383,11 +383,14 @@ impl OpenCADStudio {
                                 crate::ui::window::options::Folders::default()
                             }
                         },
+                        &self.qnew_template,
                         self.double_click_block_refedit,
                         self.double_click_block_attedit,
                         self.cursor_type,
                         self.crosshair_color,
                         &self.crosshair_color_input,
+                        self.snap_marker_color,
+                        &self.snap_marker_color_input,
                         self.lineweight_display_scale,
                         &self.model_space,
                         &self.model_bg_input,